JPH02123215A - Valve timing varying device for four-cycle engine - Google Patents
Valve timing varying device for four-cycle engineInfo
- Publication number
- JPH02123215A JPH02123215A JP27322588A JP27322588A JPH02123215A JP H02123215 A JPH02123215 A JP H02123215A JP 27322588 A JP27322588 A JP 27322588A JP 27322588 A JP27322588 A JP 27322588A JP H02123215 A JPH02123215 A JP H02123215A
- Authority
- JP
- Japan
- Prior art keywords
- cam
- valve
- exhaust
- valve timing
- varied
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003042 antagnostic effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/185—Overhead end-pivot rocking arms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0021—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of rocker arm ratio
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
- F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L1/053—Camshafts overhead type
- F01L2001/0537—Double overhead camshafts [DOHC]
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、四サイクルエンジンのバルブタイミンク可
′ａ装置に１史する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a valve timing device for a four-stroke engine.
四サイクルエンジンは、シリンダーヘッドに傘型の吸気
弁と拮気弁が摺動可能に取付けられ、クランクシャフト
に連動させたカムシャフトのカムの回転で、吸気弁及び
排気弁をバネに抗して押下げて開くようになっている。A four-cycle engine has an umbrella-shaped intake valve and an antagonistic valve that are slidably attached to the cylinder head, and the intake and exhaust valves are moved against a spring by the rotation of a cam on a camshaft that is linked to the crankshaft. It opens by pushing down.
従って、吸気弁及び排気弁のｒｒ８１ＴＩタイミング及
び開口面積は、吸気カム及び排気カムのカムプロフィル
によって定まる。Therefore, the rr81TI timing and opening area of the intake and exhaust valves are determined by the cam profiles of the intake and exhaust cams.
一方、四サイクルエンジンでは、低速に適するバルブタ
イミングと、高速に適するバルブタイミングがあって、
エンジンの主たる使用回転域によって、カムプロフィル
を定めているが、低速も高速も一つのカムプロフィルで
満足することはできない。それで、カムシャフトに対し
てカムを回転方向に回転によって捩るようにしたものが
ある。この場合には、カムプロフィルは一つであるので
、バルブタイミングを進角さゼることができるが、開口
面積は可変させることができない。一方、カムを軸方向
に順次プロフィルを変えたものを作り、回転に合せて、
カムを軸１ノ向に摺動させて、開口面積も可変できるよ
うにしたものがあるが、カムの１習動をスムースに行う
ため、ローラーを介在させるなど、その構造が複雑にな
り、製造コストが大巾に高くなって、実用的でない。例
えば、特聞１）ｉ（５５１００６５号公報参照。On the other hand, in a four-cycle engine, there are valve timings suitable for low speeds and valve timings suitable for high speeds.
The cam profile is determined depending on the engine's main rotational range, but one cam profile cannot satisfy both low and high speeds. Therefore, there is a device in which the cam is twisted by rotation in the rotational direction relative to the camshaft. In this case, since there is only one cam profile, the valve timing can be advanced, but the opening area cannot be varied. On the other hand, we made a cam with a profile that changed sequentially in the axial direction, and adjusted it according to the rotation.
There is a device that allows the cam to slide in one axis direction, making it possible to change the opening area, but in order to make one movement of the cam smooth, the structure is complicated and requires a roller, which makes it difficult to manufacture. The cost is so high that it is not practical. For example, see Special Publication 1)i (No. 5510065).
この発明は、回転する吸気用のカムと吸気弁及び、排気
用のカムと排気弁の間に、各々、上下面の曲率を変えた
カムプレートを介在さセ、カムプレートを回転に伴って
摺動及び又（よ揺動させることによって、カムの１に１
フィルは−・定でもバルブタイミングを可変したり、バ
ルブ間口面積を可変ぐさて、低速から高速まで高出力が
１９られ、＠造ちｌ！ＩＩｔｉて・部品点数も少なくて
安価に捉供できる四すイクルエンジンのバルブタイミン
グ可変装置を得ることを目的とづる。In this invention, cam plates with different curvatures on the upper and lower surfaces are interposed between rotating intake cams and intake valves, and between rotating exhaust cams and exhaust valves, and the cam plates slide as they rotate. By moving and rocking the cam one to one
Even if the fill is constant, the valve timing can be varied and the valve opening area can be varied to achieve high output from low to high speeds. The object of the present invention is to obtain a variable valve timing device for a four-cycle engine that can be provided at low cost and with a small number of parts.
（発明の構成） 以下、本発明を図面に承り実施例によって説明づる。(Structure of the invention) Hereinafter, the present invention will be explained with reference to the drawings and examples.
第１図及び第２図は本発明の一実施例を示すｂのである
。シリンダーの上面に連結するシリンダーヘッド１には
、シリンダーに面する部分に燃焼室２が設けである。燃
焼室２には、吸気孔３と開気孔４が開口させてあり、そ
の開口端に傘型の吸気弁５と排気弁６が取イ］けである
。吸気弁５及び排気弁６は、シリンダーヘッド１に摺動
可能に挿入してあって、各々バネ７で開じるように付勢
しである。吸気弁５と排気弁６の上側には、クランクシ
ャフトに連動するカムシャフト８が回転自在に軸架して
あり、二本のカムシャフト８には、吸気用カム９と排気
用カム１０が設けである。カムプレート１１は、−Ｆ下
の面の曲率が変るにうにしてあり、一方の面（図では上
面）が、半径［角。FIGS. 1 and 2 are diagrams showing one embodiment of the present invention. A cylinder head 1 connected to the upper surface of the cylinder is provided with a combustion chamber 2 in a portion facing the cylinder. An intake hole 3 and an open air hole 4 are opened in the combustion chamber 2, and an umbrella-shaped intake valve 5 and an exhaust valve 6 are installed at the open ends. The intake valve 5 and the exhaust valve 6 are slidably inserted into the cylinder head 1, and each is biased to open by a spring 7. Above the intake valve 5 and the exhaust valve 6, a camshaft 8 that is linked to a crankshaft is rotatably mounted, and the two camshafts 8 are provided with an intake cam 9 and an exhaust cam 10. It is. The cam plate 11 is configured such that the curvature of the lower surface of -F changes, and one surface (the upper surface in the figure) has a radius [angle].
［で、１で、と曲率が変化するようにしである。そして
、カムプレー１〜１１を吸気弁５ど吸気用カム９及び、
排気弁６ど排気＋１カム１０の間に介在さけろ１．カム
プレー１へ１１は最も厚い部分が、吸気弁５及び排気弁
６と当っている場合でし、カム９゜１０の山以外のとき
には、吸気弁５及び朗気弁６が聞かないように、若干の
隙間が設けである。カムプレート１１は、一端をＩＳ動
杆１２の先端に、支軸で軸着する。摺動杆１２は、シリ
ンダーヘッド１のガイド１３に挿入しで、）Ｓ動可能に
してあり、−側にラック１４が刻設してあって、ビニオ
ン１５と噛合ぜである。ビニオン−１５＋よ、エンジン
回転数に応動するサーボモーターなどで、回転速さに応
じ１回転さけ、因りノ杆１２を店！ｊＪＪさせる。[So that the curvature changes with 1. Then, the cam plays 1 to 11 are connected to the intake valve 5, the intake cam 9, and
Interposed between the exhaust valve 6 and the exhaust +1 cam 10 1. Cam play 1 to 11 is when the thickest part is in contact with the intake valve 5 and exhaust valve 6, and when the cam is other than the peaks of 9 and 10, it is slightly tightened so that the intake valve 5 and the air intake valve 6 are not heard. A gap is provided. The cam plate 11 has one end pivotally attached to the tip of the IS moving rod 12 by a support shaft. The sliding rod 12 is inserted into the guide 13 of the cylinder head 1 so as to be capable of S movement.A rack 14 is carved on the negative side and meshes with the pinion 15. Binion-15+, with a servo motor that responds to the engine speed, avoids one rotation depending on the rotation speed, and stores 12 rods! Let jJJ.
その他、ＰＰ！動杆１２は、油圧などによって、回転数
に応じて摺動ざぜるＪ：うにしてもよい。Others, PP! The moving rod 12 may be configured to slide and vibrate depending on the number of rotations using hydraulic pressure or the like.
第３図は、本発明の他の実施例を承りものである。この
場合は、ｒ′Ｉｉ動杆１２が、に’Ｔ”方向に大さく斜
めに配置してあって、摺動）１１２を摺動させると、カ
ムプレー１へ１１が吸気５↑５及び刊気弁６の上端を中
心にしてｌｒ、 ｅし、ｈムプレート１１のカム９．１
０と接する個所がθ から０２に変化するようにしであ
る。その他は、第１図及び第２図に承りものと同一であ
る。FIG. 3 depicts another embodiment of the invention. In this case, the r'Ii moving rod 12 is arranged diagonally in the 'T' direction, and when the slider 112 is slid, the cam play 11 is moved to the intake air 5↑5 and the air pressure. Center the upper end of the valve 6 on lr, e, and cam 9.1 of the hm plate 11.
The point where it touches 0 changes from θ to 02. Other parts are the same as those shown in Figures 1 and 2.
第１図及び第２図の場合は、エンジン回転に応じて、１
習動杆１２によってカムプレート１１を摺動させて、カ
ム９，１０に当る部分を可変させると、曲率Ｒ２部分で
は、第４図に示すようにバルブタイミングとバルブリフ
ト開部ちバルブ開度がＲ２で承りようになり、曲率Ｒ１
ではＰｌのように、曲率１で。ではＲ３のように変化し
、バルブタイミングに加えて、バルブ間瓜も可変できる
。又、第３図の場合は、摺動＋Ｔ１２によっ１１カムプ
レート１１を揺動させると、カムプレーｌへ１１のカム
９．１０と当る面が、０１から０２に可変することによ
って、第５図に承りように、バルブタイミングを０１か
ら０２に可変できて、進角又は遅角ができる。こうし−
Ｃ１第１図及び第２図のらのと第３図のものを組合ゼる
ことによって、バルブタイミングを進角又ｃ、ｔ 遅角
すると共に、バルブ間口面積も可変でさ、低速から高速
まで、へ出力のエンジンにできる。In the case of Figures 1 and 2, 1
When the cam plate 11 is slid by the learning rod 12 and the portion that contacts the cams 9 and 10 is varied, the valve timing, valve lift opening, and valve opening degree are changed in the curvature R2 portion as shown in FIG. R2 is now accepted, and curvature R1
Then, like Pl, the curvature is 1. Then, it changes like R3, and in addition to the valve timing, the valve timing can also be changed. In the case of FIG. 3, when the 11 cam plate 11 is swung by sliding +T12, the surface that contacts the cam plate 11 with the cam 9.10 of 11 changes from 01 to 02. As you can see, the valve timing can be varied from 01 to 02, allowing for advance or retardation. Koushi-
C1 By combining the angles in Figures 1 and 2 with those in Figure 3, the valve timing can be advanced or retarded, and the valve opening area can be varied, from low speed to high speed. , can be made into an engine with output to.
以上説明したように、この発明は、吸気弁及び排気弁を
クランクシ鵞・フｌ〜に連動さＶたカムシャフトのカム
の回転で押下げて聞き、間開させるもので、ガイドに沿
って摺動する虐動杆の先端に、上下の面の曲率を変えた
カムプレートの一端を軸着し、カムプレートをカムと吸
気弁又は排気弁の間に介在させ、店動杆をエンジンの回
転数に応じて摺動させるようにしたので、バルブタイミ
ングの進角又は遅角による可変と、バルブリフト量によ
るバルブ開口面積の可変が、エンジン回転に応じて自由
にでき、低速から高速まで高出力のエンジンにできる。As explained above, in this invention, the intake valve and the exhaust valve are pushed down and opened by the rotation of the cam of the V camshaft linked to the crankshaft, and the valves are slid along the guide. One end of a cam plate whose upper and lower surfaces have different curvatures is attached to the tip of the moving rod, and the cam plate is interposed between the cam and the intake valve or exhaust valve, and the moving rod is rotated at the engine speed. Since it is made to slide according to the engine speed, it is possible to freely change the valve timing by advancing or retarding the valve timing and variable the valve opening area by changing the valve lift amount, and it is possible to freely change the valve opening area according to the engine rotation. It can be made into an engine.
そして、カムプレートの摺動は、小さな駆動力でよく、
部品点数も少なくて、安価に生産できる。The sliding of the cam plate requires only a small driving force.
It has fewer parts and can be produced at a lower cost.
第１図及び第２図は本発明の一実施例を示し、第１図は
縦断側面図、
第２図は要部拡大側面図、
第３図は本発明の他の実施例を示１゛要部拡大側面図、
第４図及び第５図は、本発明によるバルブリフ１− ｆ
ｆｌと、バルブタイミングの可変状況を示す曲線図であ
る。
５・・・吸気か、６・・・排気弁、８・・・カムシャフ
ト、９・・・カム、１ｏ・・・カム、１１・・・カムプ
レーＩ・、１２・・・摺動杆、１３・・・ガイド。1 and 2 show one embodiment of the present invention, FIG. 1 is a vertical sectional side view, FIG. 2 is an enlarged side view of the main part, and FIG. 3 is another embodiment of the present invention. The enlarged side view of the main parts, FIGS. 4 and 5, show the valve rift 1-f according to the present invention.
FIG. 3 is a curve diagram showing fl and valve timing variations. 5... Intake, 6... Exhaust valve, 8... Camshaft, 9... Cam, 1o... Cam, 11... Cam play I, 12... Sliding rod, 13 ···guide.
Claims (1)
ムシャフトのカムの回転で押下げて開き、開閉させるも
ので、ガイドに沿って摺動する摺動杆の先端に、上下の
面の曲率を変えたカムプレートの一端を軸着し、カムプ
レートをカムと吸気弁又は排気弁の間に介在させ、摺動
杆をエンジンの回転数に応じて摺動させるようにしたこ
とを特徴とする四サイクルエンジンのバルブタイミング
可変装置。The intake and exhaust valves are opened and closed by being pushed down by the rotation of a cam on a camshaft linked to the crankshaft.The curvature of the upper and lower surfaces is changed at the tip of a sliding rod that slides along a guide. The four-cycle engine is characterized in that one end of the cam plate is pivoted, the cam plate is interposed between the cam and the intake valve or the exhaust valve, and the sliding rod is made to slide according to the rotational speed of the engine. Engine valve timing variable device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27322588A JPH02123215A (en) | 1988-10-31 | 1988-10-31 | Valve timing varying device for four-cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27322588A JPH02123215A (en) | 1988-10-31 | 1988-10-31 | Valve timing varying device for four-cycle engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02123215A true JPH02123215A (en) | 1990-05-10 |
Family
ID=17524859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27322588A Pending JPH02123215A (en) | 1988-10-31 | 1988-10-31 | Valve timing varying device for four-cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02123215A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1209326A2 (en) * | 2000-11-22 | 2002-05-29 | BorgWarner Inc. | Variable valve actuation system |
| WO2003071100A1 (en) * | 2002-02-16 | 2003-08-28 | Mahle Ventiltrieb Gmbh | Control device for a gas exchange valve in an internal combustion engine |
| WO2009011145A1 (en) * | 2007-07-16 | 2009-01-22 | Joho Corporation | System for varying total valve opening angle by variable lift |
| EP2309101A1 (en) * | 2008-06-16 | 2011-04-13 | Chery Automobile Co., Ltd. | A variable valve lift system for an internal combustion engine |
| WO2012048309A1 (en) * | 2010-10-08 | 2012-04-12 | Pinnacle Engines, Inc. | Internal combustion engine valve actuation and adjustable lift and timing |
| EP2561191A1 (en) * | 2010-04-19 | 2013-02-27 | Scania CV AB | Valve lift device for a combustion engine |
| JP5205570B2 (en) * | 2007-07-16 | 2013-06-05 | 株式会社Ｊｏｈｏ | Variable valve opening angle variable system with variable lift mechanism |
| US8776739B2 (en) | 2010-10-08 | 2014-07-15 | Pinnacle Engines, Inc. | Internal combustion engine valve actuation and adjustable lift and timing |
-
1988
- 1988-10-31 JP JP27322588A patent/JPH02123215A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1209326A2 (en) * | 2000-11-22 | 2002-05-29 | BorgWarner Inc. | Variable valve actuation system |
| EP1209326A3 (en) * | 2000-11-22 | 2003-03-26 | BorgWarner Inc. | Variable valve actuation system |
| WO2003071100A1 (en) * | 2002-02-16 | 2003-08-28 | Mahle Ventiltrieb Gmbh | Control device for a gas exchange valve in an internal combustion engine |
| US7124721B2 (en) | 2002-02-16 | 2006-10-24 | Mahle Ventiltrieb Gmbh | Control device for a gas exchange valve in an internal combustion engine |
| JP5205570B2 (en) * | 2007-07-16 | 2013-06-05 | 株式会社Ｊｏｈｏ | Variable valve opening angle variable system with variable lift mechanism |
| WO2009011145A1 (en) * | 2007-07-16 | 2009-01-22 | Joho Corporation | System for varying total valve opening angle by variable lift |
| EP2309101A1 (en) * | 2008-06-16 | 2011-04-13 | Chery Automobile Co., Ltd. | A variable valve lift system for an internal combustion engine |
| EP2309101A4 (en) * | 2008-06-16 | 2012-01-25 | Chery Automobile Co Ltd | A variable valve lift system for an internal combustion engine |
| US8701608B2 (en) | 2008-06-16 | 2014-04-22 | Chery Automobile Co., Ltd | Variable valve lift system for an internal combustion engine |
| EP2561191A1 (en) * | 2010-04-19 | 2013-02-27 | Scania CV AB | Valve lift device for a combustion engine |
| EP2561191A4 (en) * | 2010-04-19 | 2014-12-17 | Scania Cv Ab | Valve lift device for a combustion engine |
| WO2012048309A1 (en) * | 2010-10-08 | 2012-04-12 | Pinnacle Engines, Inc. | Internal combustion engine valve actuation and adjustable lift and timing |
| CN103228877A (en) * | 2010-10-08 | 2013-07-31 | 品纳科动力有限公司 | Internal combustion engine valve actuation and adjustable lift and timing |
| US8776739B2 (en) | 2010-10-08 | 2014-07-15 | Pinnacle Engines, Inc. | Internal combustion engine valve actuation and adjustable lift and timing |
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